【摘要】 通过对小湾拱坝双心圆、三心圆、椭圆、抛物线、双曲线、对数螺线和二次曲线等７种方案的拱型优化研究，认为小湾拱坝的最优线型是二次曲线，该曲线由椭圆和双曲线混合组成，坝体积为６３０万ｍ３，比抛物线的最优体形（６８７．８万ｍ３）节省５７．８万ｍ３，值得认真研究；对数螺线、双心圆和三心圆的坝体体积均大于７００万ｍ３，可予以否定。更多还原

【Abstract】 Through optimal study on the seven arch shape alternatives of double centered arch,three centered arch,elliptical arch,parabolic arch,double curved arch,logarithmic spiral arch and quadratic curve arch,it is considered that the optimum shape of Xiaowan arch dam is quadratic curve which consists of parabola and double curve.The volume of quadratic curve arch dam will be 6 3 million m 3,0 578 million m 3 less than that of parabolic arch dam (6 878 million m 3).The each volume of logarithmic spiral arch,double centered arch and three centered arch is larger than 7 million m 3 so they are all not considered.更多还原